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Micromechanical analysis of the kink‐band performance at the interface of a thermoplastic composite under tensile deformation
Author(s) -
GonzalezChi P.I.,
FloresJohnson E.A.,
CarrilloBaeza J.G.,
Young R.J.
Publication year - 2010
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.20973
Subject(s) - materials science , composite material , composite number , compression molding , deformation (meteorology) , stress (linguistics) , ultimate tensile strength , aramid , fiber , tension (geology) , thermoplastic , shear stress , molding (decorative) , mold , philosophy , linguistics
Abstract The manufacture of thermoplastic composites normally involves compression molding that generates fiber dislocations known as kink‐bands, which create stress concentrations able to cause the premature compression failure of a composite; nevertheless, the kink‐band influence over the interfacial performance or failure of a composite tested under tension is not fully understood. This work uses Raman spectroscopy as a tool to map the axial stress distribution around a kink‐band in an aramid/low density polyethylene single fiber composite. The stress distribution along the fiber was fitted to a generalized shear‐lag model to calculate the interfacial shear stress; its maximum was found around the kink‐band where the fiber interface was still bonded to the matrix, defining a localized stress concentration. POLYM. COMPOS., 31:1817–1817, 2010. © 2010 Society of Plastics Engineers.